Hi, Follow Ori Pomerantz's LKM Programming Guide, the code uses proc_register(&proc_root, &Our_Proc_File); in procfs.c to create a "file" in /proc. But I got implicit declaration error for that. In kernel 2.4.2, the proc_register() is defined at fs/proc/generic.c:350, but I do not see any header file include this. I wonder what is wrong here. Do I miss a .h file or the proc_register() is changed. Thanks, -Hong - Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/